Add Github action workflow to notify on main jobs failures

[smokingroosters]

Context:
It is useful to receive notifications whenever a github action workflow running on mail fails. Github has a slack integration that can be configured, but that sends notification for every job in any state(started, cancelled, failed, succeeded). There is an open issue that hasn't been solved for 2 years.
Because of this, a manual job that triggers based on failures of selected job on main is a better approach, and it won't need to add the notification on each single job.

Description of the Change:
A new workflow is added that will send notification to a slack channel(specified in the webhook configuration in the slack settings).

Benefits:
Get notification when specified jobs fails on main

Possible Drawbacks:
None

Related GitHub Issues:
None

[github-actions]

Hello. You may have forgotten to update the changelog!
Please edit doc/changelog.md on your branch with:

• A one-to-two sentence description of the change. You may include a small working example for new features.
• A link back to this PR.
• Your name (or GitHub username) in the contributors section.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.26%. Comparing base (2dc781f) to head (25b50a7).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #690      +/-   ##
==========================================
- Coverage   99.15%   98.26%   -0.90%     
==========================================
  Files          64       65       +1     
  Lines        9258     9387     +129     
  Branches      718      735      +17     
==========================================
+ Hits         9180     9224      +44     
- Misses         51      135      +84     
- Partials       27       28       +1     

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[dime10]

Thank you!